src/glx/glxglvnd.c

   1 #include <string.h>
   2 #include <X11/Xlib.h>
   3
   4 #include "glvnd/libglxabi.h"
   5
   6 #include "glxglvnd.h"
   7
   8
   9 static Bool __glXGLVNDIsScreenSupported(Display *dpy, int screen)
  10 {
  11     /* TODO: Think of a better heuristic... */
  12     return True;
  13 }
  14
  15 static void *__glXGLVNDGetProcAddress(const GLubyte *procName)
  16 {
  17     return glXGetProcAddressARB(procName);
  18 }
  19
  20 static unsigned FindGLXFunction(const GLubyte *name)
  21 {
  22     int first = 0;
  23     int last = DI_FUNCTION_COUNT - 1;
  24
  25     while (first <= last) {
  26         int middle = (first + last) / 2;
  27         int comp = strcmp(__glXDispatchTableStrings[middle],
  28                           (const char *) name);
  29
  30         if (comp < 0)
  31             first = middle + 1;
  32         else if (comp > 0)
  33             last = middle - 1;
  34         else
  35             return middle;
  36     }
  37
  38     /* Just point to the dummy entry at the end of the respective table */
  39     return DI_FUNCTION_COUNT;
  40 }
  41
  42 static void *__glXGLVNDGetDispatchAddress(const GLubyte *procName)
  43 {
  44     unsigned internalIndex = FindGLXFunction(procName);
  45
  46     return __glXDispatchFunctions[internalIndex];
  47 }
  48
  49 static void __glXGLVNDSetDispatchIndex(const GLubyte *procName, int index)
  50 {
  51     unsigned internalIndex = FindGLXFunction(procName);
  52
  53     if (internalIndex == DI_FUNCTION_COUNT)
  54         return; /* unknown or static dispatch */
  55
  56     __glXDispatchTableIndices[internalIndex] = index;
  57 }
  58
  59 _X_EXPORT Bool __glx_Main(uint32_t version, const __GLXapiExports *exports,
  60                           __GLXvendorInfo *vendor, __GLXapiImports *imports)
  61 {
  62     static Bool initDone = False;
  63
  64     if (GLX_VENDOR_ABI_GET_MAJOR_VERSION(version) !=
  65         GLX_VENDOR_ABI_MAJOR_VERSION ||
  66         GLX_VENDOR_ABI_GET_MINOR_VERSION(version) <
  67         GLX_VENDOR_ABI_MINOR_VERSION)
  68         return False;
  69
  70     if (!initDone) {
  71         initDone = True;
  72         __glXGLVNDAPIExports = exports;
  73
  74         imports->isScreenSupported = __glXGLVNDIsScreenSupported;
  75         imports->getProcAddress = __glXGLVNDGetProcAddress;
  76         imports->getDispatchAddress = __glXGLVNDGetDispatchAddress;
  77         imports->setDispatchIndex = __glXGLVNDSetDispatchIndex;
  78         imports->notifyError = NULL;
  79         imports->isPatchSupported = NULL;
  80         imports->initiatePatch = NULL;
  81     }
  82
  83     return True;
  84 }